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Dick Powell starred in the Richard Diamond, Private Detective radio series as a light-hearted detective who often ended the episodes singing to his girlfriend, Helen (Virginia Gregg). Other regular cast members included Ed Begley as Rick's friend and former partner on the police force, Lt. Walter Levinson, and Wilms Herbert as Walt's bumbling sergeant, Otis. It began airing on NBC Radio on April 24, 1949, picked up Rexall as a sponsor on April 5, 1950, and continued until December 6, 1950. Many of the shows were either written or directed by Edwards. Its theme, "Leave It to Love", was whistled by Powell at the beginning of each episode.

With Camel cigarettes as a sponsor, it moved to ABC from January 5, 1951, to June 29, 1951, with Rexall returning for a run from October 5, 1951, until June 27, 1952.

Substituting for Amos 'n' Andy, it aired Sunday evenings on CBS from May 31, 1953 until September 20, 1953.

Dick Powell's company, Four Star Television, produced the television version of Richard Diamond, Private Detective, which premiered in the summer of 1957 on CBS. It returned to CBS in January 1958 for the second season and in February 1959 for the third season, again on CBS. In the fall of 1959, the fourth and final season aired on NBC.

The first two television seasons followed radio’s characterization the most closely. Diamond, known for his charm and wisecracks as much as his virility, was still based in New York, though Janssen never sat at a piano and sang, as Powell had typically ended most of the radio episodes. In the noirish opening sequence, clad in hat, suit, and tie, he walks down a dimly lit street toward the camera and lights up a cigarette, the light from which shows his face. After the first season when the sponsor was Maxwell House, the show was sponsored by Kent cigarettes, and Frank DeVol’s playfully mysterious theme was heard underneath an announcer hawking “Kent with the Micronite filter.” In syndicated rebroadcasts of the series, the revised title, Call Mr. D., flashes on the screen, and DeVol’s music is replaced by Pete Rugolo’s far more recognizable theme—although that did not appear until Season 3.

Following the second season, the setting was switched from New York City to Los Angeles, and the production was entirely redesigned. The 18 episodes comprising Season 3 aired from February to mid-June of 1959, and Diamond’s character now bore only slight resemblance to his California-based noirish predecessors Sam Spade and Philip Marlowe. By the late 1950s, the glamour of Hollywood was becoming an irresistible fantasy for millions of viewers, and the popularity of Warner Brothers’ 77 Sunset Strip—which involved a good deal of location shooting and began airing four months before Diamond’s third season—undoubtedly influenced a newer P. I. image that often seemed more inspired by Hugh Hefner than by Dashiell Hammett. Diamond no longer occupied a low-rent, cloistered office, but now operated from a modern, beautifully appointed ranch house—complete with pool—in the Hollywood Hills. With panoramic sliding glass doors providing views of the mountains and the city, his sunken living room featured a bar and a loveseat, where he could be found many evenings entertaining young women before a fire. Following the lead of the Sunset Strip private eyes, he also drove a convertible—in this case a 1959 DeSoto Fireflite. The Hefner-like fantasy was enhanced by gadgets, especially Diamond’s car phone, which connected him directly to an answering service overseen by the shapely, enigmatic “Sam.” Season 3’s modern, more youthful ambience was complemented by a jazz score by composer/arranger Pete Rugolo, who created a set of big-band, Stan Kenton-esque cues for each of the episodes. In the highly stylized opening sequence, Rugolo’s robust theme is preceded by tense melodic fragments underscoring a series of frenetic, silhouette images of Diamond running, before walking forward—again in hat, suit, and tie—to light a cigarette, suggesting a re-boot of the original noirish conception. (Rugolo’s score soon became so popular that in 1959 a full album of his Diamond cues was released on the Mercury label.)

In the fourth season, which aired on NBC, the writers retained Los Angeles as the setting, but the Hefner-esque fantasy elements were considerably toned down. Now Diamond again operated from an office reminiscent of what he had known in New York, and his beautiful ranch house was replaced by an attractive—though more conventional—apartment. His car phone still connected him to Sam, but he now drove a 1959 Ford Galaxie convertible—absent the impressive tail fins of his DeSoto. Though the opening titles remained, Rugolo’s score was replaced by a more sedate theme by Richard Shores. The CBS Season 3 re-boot had aired on Sunday nights at 10 pm, but NBC moved the time slot to 7:30 pm Monday, and Season 4 began airing on October 5, 1959, with a 17-episode run that concluded late in January. Because its numbers were no longer strong, the season’s nine additional episodes were delayed, resuming only as a summer replacement on Tuesday, July 5, 1960, and concluding in early September. Though the old noirish elements were more prominent, the look of the final season seems inspired more by cost-cutting than aesthetics, and the production values appear far less glamorous than Season 3.

In addition to Janssen, the series had other recurring characters. Mirroring Diamond’s history with the New York Police Department, the radio version featured his friend, police Lt. Walt Levinson (often played by Ed Begley, Sr.), and on TV, veteran actor Regis Toomey, portraying Diamond’s former superior, Lt. Dennis "Mac" McGough, came aboard in the first episode, which aired in July 1957. Toomey then appeared intermittently in seven more, including “Snow Queen,” the final episode of Season 2, which aired on June 26, 1958. Radio’s version also gave Diamond a steady girl friend, wealthy socialite Helen Asher (played by Virginia Gregg), a story arc that was neglected by television until the first episode of Season 3, when Diamond meets fashion designer Karen Wells, played by Barbara Bain. But this may have created a conundrum for the producers, since radio’s Diamond was also an unrestrained flirt, and Powell's character often shamelessly ogled his beautiful clients before returning to Helen each week. In one TV episode, “Soft Touch,” Karen catches Diamond about to two-time her, and after five episodes, the “steady-girl-friend” arc had disappeared, with Diamond once again playing the field. When he first reached Los Angeles, Diamond had no history with the local police, and his encounters with them are often contentious. In Season 4, Russ Conway was cast as Lieutenant Pete Kile for five episodes, and their relationship soon turns to one of mutual respect, if not always warmth. The omnipresent Sam entered the picture (at least partially—viewers never saw much of her face) in Season 3 and remained for the duration of the series. She was played for most of Season 3 by Mary Tyler Moore, and later replaced by Roxane Brooks.